G.f. A(x) satisfies: (1 - x)/(1 + x) = Sum_{n=-oo..+oo} (-1)^n * A(x)^(n^2).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =0a(4) =-3a(5) =9a(6) =-15a(7) =6a(8) =56a(9) =-222a(10) =456a(11) =-322a(12) =-1562a(13) =7604a(14) =-18062a(15) =18544a(16) =46676a(17) =-293986a(18) =797456a(19) =-1066316a(20) =-1265854a(21) =11945620a(22) =-36984046a(23) =60359006a(24) =20788743a(25) =-493365441a(26) =1756737971a(27) =-3368998030a(28) =835358767a(29) =20230816709